Fluke Biomedical 07-424 - Manual (Page 12)

Nuclear Associates 07-424
Operators Manual
3-4
3.4.2 Measurement Light Source
Disconnect the unit from the power supply before
removing cover or changing fuses.
The LED used for photometric measurements is P/No. 65-158. This LED should have an extremely long
life. If the LED requires replacement, use the following procedure:
1. Remove the two (2) screws holding the plastic table to the case.
2. Carefully lift out the table using the finger slots provided on either side.
3. Pull off the tabs attached to the wires of the measurement from the printed circuit board.
It is best to use pliers on the tabs while pushing
down on the printed circuit board.
4. Loosen the screw holding the LED Socket Assembly in the LED/aperture holder and remove the
LED Socket Assembly (see Figure 3-1).
Figure 3-1. LED/Socket Assembly
5. Replace with a new LED, being careful to tighten the LED/Aperture Holder screw only enough to
hold the LED Socket Assembly in place. When the LED is properly positioned vertically, it will
almost touch the aperture in the holder.
6. Return the light table top to its position on the board and fasten it in place.
This instrument contains CMOS Integrated circuits.
No service should be attempted unless by a
qualified technician thoroughly familiar with CMOS
devices. Static charges normally present in a dry
atmosphere or leakage current in soldering irons or
other non-grounded tools can instantly destroy
CMOS integrated devices. Do not attempt to
remove or replace any IC sockets without
WARNING
NOTE
WARNING